Dale---Many of the modern paints won't last too long when submerged in
gasoline, but the Zyno, or Rustoleum Red primer should hang on long
enough to find out what you want. Other products that harden and can be
profiled also can do the job easier than tinning with solder. Bondo's
'Glazing and Spot Putty' is one of them. Dries hard but is machinable.
Holds up well to fuel.
I'm assuming that you have some means of determining, other than
seat-of-the-pants, when a needles profile is either too rich or too lean
at various stations. It is true that there is quite a variety of
off-the-shelf needles to choose from. If you are using an 02 sensor and
an Air/Fuel Monitor to sort out the needle choices, then we know there
can be lapses when none of them satisfies both power with reasonable
mileage, esp. when engines have been modified for a particular setup.
I could not identify the BDB needle that you mentioned.
For thse wondering how it is possible to further thin the "toothpick",
the short side of this is a setup that requires that the needle to be
supported down its length. This (tapered) support block must have marked
1/8 inch increments that show the different stations down the needle.
Machine where required. It's not all that difficult if time is no
object, and one likes doing this sort of chore! (Money doesn't enter
into it)
Dick
From: osternd@copper.net(dmo) To:tr6taylor@webtv.net (Sally or Dick
Taylor)
Dick,
I haven't tried the paint approach - sounds like a good temporary
solution other than the possibility that the paint would be dissolved by
the fuel coming up through the jet? Maybe use a fuel resistant coating?
I did attempt to tin the needle with solder but not too successful with
that. I got aggravated with that pretty quickly as it didn't flow well
and was "lumpy". The needle may not have been clean (OR HOT -dt-)
enough, but something about trying to heat a spinning needle with a
torch while flowing solder on it was a bit unnerving. I can spend all
day sanding, measuring, testing (repeat if necessary) but didn't have
much patience for doing that! So, I thought it would best to start over
and get it right.
I have the Des Hammill book (very good book, BTW), but I have not had
much luck with his approach to testing mixture and determining what
stations to modify. I'm still working on a better solution for that.
Dale O
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